Reddit reviews CovoBox v2— Hidden Storage Book Box | Electronics Hider | Hide Router, Cable Box, Modem, Cords, Plugs, Outlets, Money, Secret Documents, or Jewelry | Made with Real Used Books | Closed Tops

A couple notes:

• There's a 2-3" gap between the non-end books and the wall that should allow for air to circulate and keep the modem relatively cool (or at least keep it from getting too hot). I'm also monitoring it with an infrared thermometer to make sure it doesn't get too warm.
  
• The modem is plugged into the round white thing on top of the books. That's Google WiFi which is where my wireless network actually comes from so there's no signal loss.
  
• The books were all bought from used bookstores for <$5. We didn't want to cannibalize our books so we felt like giving books that seemed to be on their last leg a sort of forever home.
  
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  If you're interested in this but don't feel like making it, go here. Not trying to steal anyone's livelihood. Just felt like trying to make something.